When foraging herbs make sure to do so away from roadways, fields, or other areas with excess pollutants. It's important to take multiple pictures with you to identify when you're new to foraging. Make sure to have images of the whole plant, leaves, leaf structure, stems, flowers (if in bloom), fruits (if fruit bearing), seeds (if seed bearing), and any other notable parts of the plant. The difference between a tasty meal and eternal darkness can be just an extra leaflet or a different hue on the stem.
This is how I get most of my herbs. It's one of the cheapest ways, and in some casess you get to support local buisness!
Chamomile, Ginger, Green tea, Hibiscus, Lavender, Mint, Peppermint, Rosemary, Sage, Tarragon, Yerba MateCommonly Stocked Smokable Herbs